This paper presents an analysis of the low-cycle fatigue (LCF) process during fatigue testing of welded steel joints by therrnographic investigations. Infrared thermography has been applied in the past to investigate high-cycle fatigue (HCF) of metals and welded joints, and it has been found that the thermal pattern of the specimen surface during HCF tests is characterized by three phases with a stabilized temperature. A similar thermal pattern was observed in the LCF tests. The thermal increments during the LCF life were correlated to the hysteresis loops derived from the traditional procedure and the experimental results confirm that there is a correlation between the stable hysteresis loops and the stabilized temperature. Moreover, the LCF behavior of welded joints was compared to that of the base material.
Using Infrared Thermography in Low-Cycle Fatigue Studies of Welded Joints
CRUPI, Vincenzo;GUGLIELMINO, Eugenio
2010-01-01
Abstract
This paper presents an analysis of the low-cycle fatigue (LCF) process during fatigue testing of welded steel joints by therrnographic investigations. Infrared thermography has been applied in the past to investigate high-cycle fatigue (HCF) of metals and welded joints, and it has been found that the thermal pattern of the specimen surface during HCF tests is characterized by three phases with a stabilized temperature. A similar thermal pattern was observed in the LCF tests. The thermal increments during the LCF life were correlated to the hysteresis loops derived from the traditional procedure and the experimental results confirm that there is a correlation between the stable hysteresis loops and the stabilized temperature. Moreover, the LCF behavior of welded joints was compared to that of the base material.Pubblicazioni consigliate
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